/*
 * Copyright (c) 2012 Mikaël GUILLEMOT
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package tools;

import java.io.IOException;
import java.io.InputStream;

public class Runner {

	/**
	 * permet de demarer un process externe. prend en parametre le chemin et le
	 * nom de l'executable a demarrer.
	 * 
	 * Note : cette methode attend la fin de l'execution du process
	 * 
	 * @param path
	 * @return le code de retour du process
	 * @throws IOException
	 */
	public static int runExternalProcess(String path) throws IOException {
		Process proc = Runtime.getRuntime().exec(path);
		InputStream err = proc.getErrorStream();
		InputStream out = proc.getInputStream();
		int exitValue = 0;
		boolean wait = true;
		// tant qu'on a pas un retour ou que les flux ne sont pas vide
		while (wait || err.available() > 0 || out.available() > 0) {
			if (err.available() > 0 || out.available() > 0) {
				if (out.available() > 0)
					System.out.write(out.read());
				else
					System.err.write(err.read());
			} else if (wait) {
				try {
					exitValue = proc.exitValue();
					wait = false;
				} catch (IllegalThreadStateException e) {
					try {
						Thread.sleep(100);
					} catch (InterruptedException e1) {
					}
				}
			}
		}
		return exitValue;
	}
}
